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twl4030_charger: Add backup-battery charging

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This allows a voltage and current (bb_uvolts and bb_uamps) to be
specified in the platform_data, and charging of the backup battery will
be enabled with those specification.

As it is not possible to monitor the backup battery at all there is no
new device created to represent it.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
NeilBrown 2012-05-09 07:40:40 +10:00 committed by Anton Vorontsov
parent 9c645d2f88
commit 210d4bc8a3
2 changed files with 61 additions and 0 deletions
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59
drivers/power/twl4030_charger.c
View File

@ -28,6 +28,7 @@
#define TWL4030_BCIVBUS 0x0c
#define TWL4030_BCIMFSTS4 0x10
#define TWL4030_BCICTL1 0x23
#define TWL4030_BB_CFG 0x12
#define TWL4030_BCIAUTOWEN BIT(5)
#define TWL4030_CONFIG_DONE BIT(4)
@ -37,6 +38,17 @@
#define TWL4030_USBFASTMCHG BIT(2)
#define TWL4030_STS_VBUS BIT(7)
#define TWL4030_STS_USB_ID BIT(2)
#define TWL4030_BBCHEN BIT(4)
#define TWL4030_BBSEL_MASK 0b1100
#define TWL4030_BBSEL_2V5 0b0000
#define TWL4030_BBSEL_3V0 0b0100
#define TWL4030_BBSEL_3V1 0b1000
#define TWL4030_BBSEL_3V2 0b1100
#define TWL4030_BBISEL_MASK 0b11
#define TWL4030_BBISEL_25uA 0b00
#define TWL4030_BBISEL_150uA 0b01
#define TWL4030_BBISEL_500uA 0b10
#define TWL4030_BBISEL_1000uA 0b11
/* BCI interrupts */
#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
@ -201,6 +213,49 @@ static int twl4030_charger_enable_ac(bool enable)
return ret;
}
/*
* Enable/Disable charging of Backup Battery.
*/
static int twl4030_charger_enable_backup(int uvolt, int uamp)
{
int ret;
u8 flags;
if (uvolt < 2500000 ||
uamp < 25) {
/* disable charging of backup battery */
ret = twl4030_clear_set(TWL4030_MODULE_PM_RECEIVER,
TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
return ret;
}
flags = TWL4030_BBCHEN;
if (uvolt >= 3200000)
flags |= TWL4030_BBSEL_3V2;
else if (uvolt >= 3100000)
flags |= TWL4030_BBSEL_3V1;
else if (uvolt >= 3000000)
flags |= TWL4030_BBSEL_3V0;
else
flags |= TWL4030_BBSEL_2V5;
if (uamp >= 1000)
flags |= TWL4030_BBISEL_1000uA;
else if (uamp >= 500)
flags |= TWL4030_BBISEL_500uA;
else if (uamp >= 150)
flags |= TWL4030_BBISEL_150uA;
else
flags |= TWL4030_BBISEL_25uA;
ret = twl4030_clear_set(TWL4030_MODULE_PM_RECEIVER,
TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
flags,
TWL4030_BB_CFG);
return ret;
}
/*
* TWL4030 CHG_PRES (AC charger presence) events
*/
@ -424,6 +479,7 @@ static enum power_supply_property twl4030_charger_props[] = {
static int __init twl4030_bci_probe(struct platform_device *pdev)
{
struct twl4030_bci *bci;
struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
int ret;
u32 reg;
@ -503,6 +559,8 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
twl4030_charger_enable_ac(true);
twl4030_charger_enable_usb(bci, true);
twl4030_charger_enable_backup(pdata->bb_uvolt,
pdata->bb_uamp);
return 0;
@ -531,6 +589,7 @@ static int __exit twl4030_bci_remove(struct platform_device *pdev)
twl4030_charger_enable_ac(false);
twl4030_charger_enable_usb(bci, false);
twl4030_charger_enable_backup(0, 0);
/* mask interrupts */
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,

2
include/linux/i2c/twl.h
View File

@ -555,6 +555,8 @@ struct twl4030_clock_init_data {
struct twl4030_bci_platform_data {
int *battery_tmp_tbl;
unsigned int tblsize;
int bb_uvolt; /* voltage to charge backup battery */
int bb_uamp; /* current for backup battery charging */
};
/* TWL4030_GPIO_MAX (18) GPIOs, with interrupts */